Value | How amazon defines this | How is it used | Note | Example |
Product Weight | Weight of the product with no other external packing or other items included. | Is used as an input to calculate the unit weight | A light bulb | |
Unit Weight (referred to as item unit weight) | Weight of the product with necessary packing items that come with it. | Is used as an input to calculate the shipping weight as well as product size tier. | Depending on the size tier of the product, either the unit weight or the dimensional weight will be used to calculate the shipping weight. | A light bulb with the owners manual and its retail box |
Shipping Weight | The shipping weight is the product's combined unit weight and is the measure of how much your product weighs packaged. | The shipping weight of an item is used to calculate FBA fulfillment fees | Shipping weight also takes into account the dimensional weight in certain cases. | A light bulb with the owner manual and retail box plus the bubble wrap and cardboard box used to ship it |
Dimensional Weight | Dimensional weight is an estimate of what the weight will be based on the product’s dimensions. It is a weight calculation of the volumetric weight of a package, using the package’s length, width, and height. | The dimensional weight of an item is used to calculate FBA fulfillment fees and storage fees. | Depending on the size tier of the product, either the unit weight or the dimensional weight will be used to calculate the shipping weight. | The Height x length x width, divided by 139 of the retail box of the light bulb with everything. |
Product size tier | Measurement categories are based on the unit weight, product dimensions, and dimensional weight of the packaged item. | The product size tier is used to calculate monthly storage fees | ||